PDF malware analysis — malicious · 8c73570b26086d03

MALICIOUS

PDF

50.7 KB Created: 2020-07-30 12:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 05eca3313ace647f83e5b4c73e157b85 SHA-1: b17ba577b2aeda362466321c5f7aaa4f775eca63 SHA-256: 8c73570b26086d03cd04ed034e9d21212f66d27a695c0b5742d3ae3303880148

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This indicates the document is designed to redirect users to malicious sites. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/pify?keyword=free+academic+ielts+writing+task+1+sample+answers+pdf
- http://files.paintedskyalpacafarm.com/uploads/1/3/1/6/131606965/woxodojuneb_tasaxenarom_merex_rifarobulaz.pdf
- http://files.theguardianofnature.org/uploads/1/3/1/4/131453429/najozedunipa.pdf
- http://files.allisonattitude.com/uploads/1/3/1/8/131872087/dudobikuluru.pdf
- http://files.blackburnlegal.com/uploads/1/3/1/4/131453170/9893178.pdf
- https://cdn.shopify.com/s/files/1/0432/7335/5424/files/69923208146.pdf
- https://cdn.shopify.com/s/files/1/0427/4061/3286/files/17642396402.pdf
- https://cdn.shopify.com/s/files/1/0431/7193/8461/files/zojesaguza.pdf
- https://cdn.shopify.com/s/files/1/0430/5285/9543/files/8017165449.pdf
- https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bexijefafitikekuvamiwo.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99203043279.pdf
- https://cdn.shopify.com/s/files/1/0436/4858/1782/files/18697402718.pdf
- https://cdn.shopify.com/s/files/1/0434/0711/4391/files/33073367819.pdf
- https://cdn.shopify.com/s/files/1/0432/4986/0765/files/71097834638.pdf
- https://cdn.shopify.com/s/files/1/0429/5704/5913/files/221014381.pdf
- https://cdn.shopify.com/s/files/1/0437/0595/8565/files/55884520152.pdf
- https://cdn.shopify.com/s/files/1/0428/4658/4999/files/gewopusunuketibasos.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000085cd.bin` `3b076b5692b50ecc2789b6aaa0175920063ed40b9cec0b797e055b768a4bad0e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x85CD	5316 bytes
`font_01_sfnt_off000097e0.bin` `d2e881fe4724658ac8a1b41444c46bc05cdc9cc3d18ef4980993f2b96e279b51`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x97E0	10888 bytes

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